Hi Carolyn,
Thanks. Tried a Web search and did not find much. Seed Savers Exchange catalog of 2007 had a small blurb on them. I suppose the "Del Mar" isn't "of the sea" so much as it is "Delaware Maryland," which leads me to guess that this is an Atlantic seaboard variety.
One of the things I stumbled upon was that Lewes, MD had a neighborhood called "Tomato Alley" known for its canning activity at one time.
https://delmarhistory.blogspot.com/2...-in-lewes.html
Too late to try starts again, maybe will try again next spring.